Diamond Certification

What is a Diamond Certificate?

• Definition: a diamond certificate is an official document issued by a gemological laboratory detailing the attributes of the diamond.

Major Certification Bodies

• GIA (Gemological Institute of America): Known for its strict grading standards and detailed reports.
• AGS (American Gem Society): Provides detailed grading with a focus on cut quality.
• IGI (International Gemological Institute): Widely recognized, especially for lab-grown diamonds.
• EGL (European Gemological Laboratory): Known for more lenient grading compared to GIA and AGS.

What to Look for in a Certificate

• Grading Report: Includes details on the 4 Cs and other characteristics like fluorescence.
• Laser Inscription: Some diamonds have a laser inscription on the girdle that matches the certificate number for verification.
• Authenticity and Transparency: Certificates provide assurance of the diamond’s quality and authenticity.

GIA (Gemological Institute of America) Certification Sample

Diamond Grading Report

1. Report Number: 1234567890
2. Shape and Cutting Style: Round Brilliant
3. Measurements: 6.50 - 6.52 x 3.94 mm
4. Carat Weight: 1.00 carat
5. Color Grade: D
6. Clarity Grade: VS1
7. Cut Grade: Excellent
8. Polish: Excellent
9. Symmetry: Excellent
10. Fluorescence: None
11. Inscription(s): GIA 1234567890 (laser inscribed on the girdle)

Comments:

• None

Diagram:

• Inclusions and blemishes location and type (plot)

Proportion Diagram:

• Detailed cut proportions (table size, crown angle, pavilion angle, etc.)

AGS (American Gem Society) Certification Sample

Diamond Quality Document

1. Document Number: 9876543210
2. Shape and Style: Princess Cut
3. Carat Weight: 1.20 carat
4. Color Grade: AGS 0 (Colorless)
5. Clarity Grade: AGS 2 (Very Slightly Included)
6. Cut Grade: AGS Ideal 0
7. Polish: AGS Ideal 0
8. Symmetry: AGS Ideal 0
9. Proportions: AGS Ideal 0
10. Fluorescence: Negligible

Comments:

• Laser Inscription: AGS 9876543210

Proportion Analysis:

• Table percentage, depth percentage, crown angle, pavilion angle

Light Performance Map:

• Analysis of light performance, showing brightness, fire, and scintillation

IGI (International Gemological Institute) Certification Sample

Diamond Report

1. Report Number: 1122334455
2. Shape and Cut: Oval Brilliant
3. Carat Weight: 1.50 carat
4. Color Grade: E
5. Clarity Grade: SI1
6. Cut Grade: Very Good
7. Polish: Very Good
8. Symmetry: Very Good
9. Fluorescence: Faint

Comments:

• Inscription: IGI 1122334455

Diagram:

• Inclusions and blemishes (plot)

Proportions:

• Detailed measurements and angles

EGL (European Gemological Laboratory) Certification Sample

Diamond Certificate

1. Certificate Number: 5566778899
2. Shape: Pear Shape
3. Carat Weight: 2.00 carat
4. Color Grade: F
5. Clarity Grade: VVS2
6. Cut Grade: Excellent
7. Polish: Excellent
8. Symmetry: Excellent
9. Fluorescence: Medium Blue

Comments:

• Laser Inscription: EGL 5566778899

Diagram:

• Detailed plot of inclusions and blemishes

Proportion Diagram:

• Detailed proportions and measurements